I get you actually.

MVC churn was real, EF Churn was real, heck NETCORE itself was a (at least warned about) churn, 3.1->6.0 was minor but still definitely a thing [0].

[0] - Now that I'm thinking it out loud, maybe that's why they changed the branding from .NET CORE to just .NET; The churn was more or less 'done'...

I'm only now deprecating a netcore 2.2 API that used a 4.8 framework domain/repository layer. At the time it seems like a good idea and it received automatic security patches.

Online forums often have people asking "hey I found this tutorial for learning c# but it's way way back for .NET 7 will it even work in .NET 9?"

The answer is always a variation of "yes, you'll be fine, but also look at a "what's new" summary for the new version.